Is ami kodama



l. KODAMA.

SPARK PLUG.

APPLICATION FILED NOV. 28, 1919.

1,368,036. Patented Feb. 8, 1921.

it i0 l/Vilmesses invent-0f" j amjzjodam 3 its cert;

rrsur orr ce.

ISAMI KODAMA. OF PHILADELPHIA, PENNSYLVANIA.

SPARK-PLUG.

Application filed November 28, 1919. Serial No. 341,294.

Gne object of my invention is to providean improved spark plug which will be of particular advantage for use in connection with an internal combustion engine and which will produce sparks of such character as to provide a sure and complete combustion of the gases within the engine.

Another object'is to so construct my improved spark plug that the action of the explosion oi the gases will move a part of one of the electrodes in such manner as to prevent the collection of carbon deposit thereon.

Another object is to so construct one of the portions of the electrodes that it will serve as a bearing for the movable portion of the electrode and at the same time will serve as retaining means for said movable portion of the electrode.

A. still further object is to so design my improved spark plug that the above mentioned portions of the electrode can be readily positioned and that the central electrode insulator will be so shaped as to assist in preventing carbon deposit thereon and on the adjacent parts of the electrode so as to prevent short-circuiting of the electrode current.

These objects, and other advantageous ends which will be described hereinafter, I

attain in the following manner, reference being had to the accompanying drawings in which Figure 1 is an elevation of a spark plug having a portion shown in section and illustrating my invention, s

Fig. 2 is an inverted plan view of Fig. 1, and s Fig. 3 is an inverted plan view of one oi the elements of my invention. I

Referring to the drawings, 4 represents the metallic body portion of a spark plug which is preferably provided with a lower hollow screw threaded stem 5 whereby the plug can be screwed into the cylinder of an internal combustion engine in the usual manner. A central electrode 6 1s incased 1n an insulator 7 which may be made of porcelain Specification of Letters Patent.

or other material out of which insulators of this character are usually made. lhis insulator at its bottom has an inwardly tapering recess 8 through which a portion of the central electrode projects; it being noted that the upper portion of the central electrode has a binding nut 9 thereon whereby an electric conduit wire can be attached in the usual manner. The insulator 7 has a flange 10 which in cross section, as shown in Fig. 1, tapers to a peripheral thin edge 11. The portion 12 immediately-below the flange is preferably made cylindrical and a groove 13 is formed in the insulator 7 immediately below the portion 12. A. metallic member 14 is made in'the form of a wheel having twisted or bent blades 15 which serve as propelling or fan blades for rotating said member due to the explosion of gas as will be more completely described hereinafter. The member 14 has a central hole 16 which fits the cylindrical portion 12 above the groove 13. A split metallic ring 17 is adapted to be snapped within the groove 13 and forms a bearing to support the member 14 in the position shown in Fig. 1"; it being noted that there is a direct contact between the member 14 and the split ring 17.

The split ring 17 has a finger 18 bent downwardly therefrom; the lower end of said finger being positioned directly adja-- cent the lower end or" the central electrode 6.

By the above arrangement when electric current is passed through the plug, aspark will be produced between the finger 18 and the bottom end of the central electrode 6 and between the blades 15 and the body portion 4 ot the plug. The force. of combustion of the gases produced by the sparks acts upon the blades 15 so as to rotate the member 14 and by thus rotating under the pressure of the gas, the chance of carbon deposit accumulating on the member 14 is reduced to a minimum. Also by shaping the. flange 10 so as to provide a thin peripheral edge, it will be noted that this flange will be heated to an extremely high temperature and will burn off the carbon thereon and on adjacent parts of the member 14 as fast as it accumulates.

To remove the member 14, it is merely necessary to spread the split ring 17 so as to remove the latter, after which the member 14 can be easily slid off the lower end of the insulator 7.

Patented Feb. 8, 1921.

taking a particular form, it will be understood that the various parts of my invenforth, but consider that I am at liberty to make such changes and alterations as fairly come within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is l. A spark; plug including an. electrode insulator; an electrode extending there through; a body portion surrounding said insulator; a member fitting on said insulator and having parts adjacent said body portion; and a member detachably clamped on said: insulator and forming a retainer for said firstmember whereby said first member is held to the insulator, said second member having portion extending adjacent said electrode whereby sparks will be produced between said latter part of the second mentioned member. and said elec trode and. between said parts of the mentioned member and said body portion of the plug, said portion of the insulator above said clamped member projecting to form a flange tapering to its outer edge; substantially asdescribed 2. A spark plug including an electrode insulator; an electrode extending therethrough; a body portion surrounding said insulator; a member rotatably fitting said insulator and having'parts located adjacent said body portion; and a ring detachably connected to said insulator and forming an un'dersupport for said first member, said ring having a portion located adjacent said electrode wh reby sparks will be produced between said portion of the secono mentioned member and the electrode and between said parts of the first mentioned mom her and the body portion of the spark plug; substantially as described.

3. A spark plug including an electrode insulator; an electrode extending therethrough; a body portion surrounding said insulator; a member rotatably fitting said insulator and having parts located adjacent said body portion; and a. ring detachably connected to said insulator and forming undersupport for said first member, said ring having a portion located adjacent said electrode whereby sparks will be produced between said portion of the second men tioned member and the electrode and between saidparts of the first mentioned member and the body portionof the spark plug,

ISAMI KQDAMA.

Witnesses:

CHAS. E. Poms, ANNA BENTON. 

